5d Mk II owners- Would you buy it again? Who has had no probs?

I had a 5d Mk II for one shot before the err 20 came on and never went away. Of those who purchased a mkii, how many have had problems requiring a return and exchange? Is this just new camera line production "teething" or is there something else going on? I want to believe in this camera, but I have had my confidence shaken that the camera died after the very first shot!